Mechanism for finishing engine bed-frames



(No Model.)

W. F. PARISH.

MECHANISM FOR FINISHING ENGINE BED FRAMES. No. 332,744. Patented Dec. 22, 1885.

4%). 2% 7f min/6686a jw/en'ior UNITED STATES PATENT OFFICE.

\VILLIAM F. PARISH, OF MINNEAPOLIS, MINNESOTA.

MECHANISM FOR FINISHING ENGINE BED-FRAMES.

SPECIFICATION forming part of Letters Patent No. 332,744, dated December 22, 1885.

Application filed October 16, 1885. Serial No. 180,069. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM F. PARISH, a citizen of the United States, residing at Minneapolis, in the county of Hennepin andv State of Minnesota, have invented certain Improvements in Mechanism for Finishing Engine Bed-Frames, of which the following is a specification.

My invention relates to means for preparing and fitting cast-iron bed-frames of engines to receive the parts of the engine that are supported thereby. These bedframes are usually cast in one piece, and they have preferably a circular end,to which the end of the cylinder is secured, and through which the piston-rod extends. They have also a box or boxes for the crank-shaft, and project-ions or lugs, to which the guides for the cross-heads are secured. It is desirable to provide means by which these parts of the bed-frames may be fitted and aligned, so that when the engine is put together its working parts, supported by the bed-frame, will all be in correct position, and to do this work in a cheap and expeditious manner.

The present invention relates to the means for truing and aligning the opening through the end of the bed-frame to receive the screwthreaded stuffingbox through which the piston-rod passes. It is necessary that this opening be trued and aligned so that its center will be coincident with the axis of the pistonrod of the finished engine.

In the drawings forming part of this specification, Figure 1 is a plan of the bed-frame, partly broken away, with the arbor and tap in position therein. Fig. 2 is a front elevation, and Fig. 3 a side elevation of the tap. A represents a cast-iron bed-frame. It is cast in one piece, and has the end A, to which the end of the cylinder is bolted, and also, preferably, the projections or lugs L L, to which the guides for the cross-head are secured, and a box or boxes, P, for the crankshaft.

B represents an arbor, which is preferably of the T shape, having the cross part E at right angles to the main part of the arbor. This arbor is centered in the bed-frame, so that its axis occupies the position that will be cccupied by the axis of the piston-rod in the finished engine.

0 G are plates or blocks, by which the arbor is centered in the bed-frame and held in proper alignment while the opening through the end of thebedis trued and aligned. These plates are secured to the arbor by suitable means-as the bolts D-and are provided with adjusting-screws F, by means of which the plates may be adjusted and the arbor centered and aligned. The cross-arbor E, when used, will be brought into proper position by the centering of the arbor B, and the boxes may be finished by pouring Babbitt or other suitable metal around this cross-arbor. The cross-arbor may, however, be omitted. The opening through the end of the bed is trued and aligned by means of a hollow reamer' mounted on the arbor that is centered in the bed-frame, as described and claimed in another application of even date herewith.

H represents a tap having anopening through it to fit closely over the arbor, and provided with a series of cutting-threads, H. This tap is placed over the arbor and inserted into the opening in the end of the bed. The tap is rotated on the arbor, and a spiral thread is thereby cut in the wall of the opening, which is necessarily true throughout, and whose axis is coincident with the axis of the arbor. This thread receives the screw-threaded stuffingbox, whose center must, therefore, coincide with the position occupied by the axis of the arbor, and this brings the axis of the pistonrod into the same position.

The means for centering the arbor may obviously be varied without departing from my invention.

No claim is made in this application to means for truing and aligning other parts of the bedframe.

I claim as my invention- The combination, with the arbor B and means for centering said arbor in an engine bed-frame, 0f the tap H, having an opening therein to fit said arbor, and provided with the cutting-threads H, all substantially as described, and for the purpose set forth.

WILLIAM F. PARISH.

Witn esses Louis SOHLESINGER, A. 0. PAUL. 

